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PSN back up for some, except for the store.
By Zack SteinPlayStation Network was unavailable Sunday morning due to a denial-of-service, commonly referred to as DDoS, attack.

Sony President of Online Entertainment John Smedley confirmed the attack via Twitter. The official PlayStation Twitter feed also tweeted out they were aware of the issue and were working to get things up and running.

The network was partially restored for some users by 10 am PT, with services like Netflix available for streaming. However, when trying to access the PlayStation Store, a message read that it is currently undergoing maintenance. Sony previously announced that the PlayStation Network will be down tomorrow for scheduled maintenance. It's unclear right now whether the maintenance has started earlier than expected.